can't pass '%' to pandas.DataFrame.add_prefix · Issue #17151 · pandas-dev/pandas (original) (raw)

Code Sample, a copy-pastable example if possible

From this stackoverflow question

import pandas as pd df = pd.DataFrame(dict(A=[1])) df.add_prefix('%')

Problem description

Current implementation uses old style string formatting and breaks when passing a percent sign

Expected Output

Output of pd.show_versions()

[paste the output of pd.show_versions() here below this line]

INSTALLED VERSIONS

commit: None
python: 3.6.0.final.0
python-bits: 64
OS: Darwin
OS-release: 16.6.0
machine: x86_64
processor: i386
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8
LOCALE: en_US.UTF-8

pandas: 0.20.3
pytest: 3.0.5
pip: 9.0.1
setuptools: 36.2.0
Cython: 0.25.2
numpy: 1.13.1
scipy: 0.18.1
xarray: 0.9.5
IPython: 5.1.0
sphinx: 1.5.1
patsy: 0.4.1
dateutil: 2.6.1
pytz: 2017.2
blosc: None
bottleneck: 1.2.0
tables: 3.3.0
numexpr: 2.6.1
feather: 0.4.0
matplotlib: 2.0.0
openpyxl: 2.4.1
xlrd: 1.0.0
xlwt: 1.2.0
xlsxwriter: 0.9.6
lxml: 3.7.2
bs4: 4.5.3
html5lib: 0.9999999
sqlalchemy: 1.1.5
pymysql: None
psycopg2: None
jinja2: 2.9.4
s3fs: None
pandas_gbq: None
pandas_datareader: 0.4.0